Possible reclaimation deadlock

[TiborB]

Hi,

we have following storage pool with 5 tapes:


select VOLUME_NAME,PCT_UTILIZED,STATUS from volumes where STGPOOL_NAME='........'
VOLUME_NAME PCT_UTILIZED STATUS
------------------ ------------ ------------------
F00006L4 100.0 FILLING
F00007L4 9.7 FULL
F00008L4 23.8 FULL
F00009L4 19.5 FULL
F00000L4 100.0 FULL

Reclaimation treshold is 60 as usuall.

My question is - is this situation above an deadlock? TSM would want to move content of three tapes to some other tape, but storage pool maxscratch limit is achieved already (it is 5 obviously). And there are no scratch L4 tapes anyway in the library.

Just note that this is next storage pool only.

If there was a L4 scratch tape in library, could TSM use it - i.e. temporarily exceed maxscratch limit just for it can do reclaimation?

I know that I can still do 'move data' to primary storage pool to provide one free L4 tape.

So the question is - can TSM cope with this situation by itself? (do not consider possible expiration of data in the future)

And I ask it just to learn more about how TSM works.

Thanks

 

[moon-buddy]

NO scratch tape means no reclamation runs.

If you have a scratch tape, TSM will run the reclamation and the three lowest % utilized will be scratched bringdown your max scratch to 3 after reclamation runs.

 

[TiborB]

I am not sure if you understand the situation.
Situation is:

Maximum Scratch Volumes Allowed: 5
Number of Scratch Volumes Used: 5

Question: If there is another free/scratch volume in library, will space reclaimation take the place? Percentage below indicates that probably 2 tapes could be freed.

 

[moon-buddy]

I am not sure if you understand the situation.
Situation is:

Maximum Scratch Volumes Allowed: 5
Number of Scratch Volumes Used: 5

Question: If there is another free/scratch volume in library, will space reclaimation take the place? Percentage below indicates that probably 2 tapes could be freed.

As I said, if you don't have any scratch tape in the library, no recalamtion runs. If you have one scratch tape, reclamation will run even if you have the condition stated above.

 

[TiborB]

Thanks,

It is clear now.
I dont have a scratch tape in the library but I can add one...